Who clearly proved and defined linkage?

The percentage of crossing over will be more if:

Discuss why Drosophila has been used extensively for genetical studies.

For the physical association of genes on a chromosome,Morgan coined the term $...............$ and for the generation of non-parental gene combinations,he described the term $...............$.

Select the incorrect statement$(s)$ from the options given below with respect to dihybrid cross.
$I.$ Tightly linked genes on the same chromosome show higher recombinations.
$II.$ Genes far apart on the same chromosome show very few recombinations.
$III.$ Genes loosely linked on the same chromosome show similar recombinations.

What will be the number of linkage groups in maize if it has $10$ pairs of chromosomes?